Transmission for energy storage device, energy storage device and method for controlling the transmission
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United States of America Patent
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Oct 29, 2019
Grant Date -
Mar 1, 2018
app pub date -
Mar 1, 2016
filing date -
Mar 12, 2015
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A transmission for an energy storage and recovery system is disclosed. A variable slip transmission and a clutch arranged to transmit drive while slipping. The level of torque transmitted through the slipping clutch is dependent on the clutch force but is independent of the clutch slip speed. Preferably the clutch is provided by a plurality of clutches connected in parallel in a range extender. When drive is transferred between clutches in parallel, the clutch forces of both clutches are controlled to maintain the total torque transmitted by the clutches. This reduces torque fluctuations at the energy source/sink during clutch transfer. Where there are two slipping clutches in series, one clutch is controlled to provide the required torque and the other clutch is controlled in response to a clutch slip speed. This helps to control the speed of rotation of the mass between the clutches.
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